Solve the problem.The time of a telephone call (in minutes) to a certain town is a continuous random variable with a probability density function defined by 
for 
Find the probability: 
A. 0.2170
B. 0.3170
C. 0.9999
D. 0.7830
Answer: C
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Find the derivative of y.y = -2t3 tanh 
A. -6t2 tanh 
+ 4 sech 
B. -6t2 tanh 
+ 4 sech2 
C. -6t2 tanh 
- 4 sech2 
D. -6t2 tanh 
+ 2 sech2 
Solve the problem.In a certain city, the cost of a taxi ride is computed as follows: There is a fixed charge of $2.95 as soon as you get in the taxi, to which a charge of $1.95 per mile is added. Find an equation that can be used to determine the cost, C(x), of an x-mile taxi ride, and use this equation to find the cost of a 5-mile taxi ride.
A. $12.58 B. $13.60 C. $12.88 D. $12.70
Simplify.19361/2
A. 176 B. 44 C. 22 D. 88
Solve the problem.After an injection, the amount of a medication A in the bloodstream decreases with time t, in hours. Suppose that under certain conditions A is given byA(t) = 
, where Ao is the initial amount of the medication given. Assume that an initial amount of 20.0 cc is injected. According to this function, does the medication ever completely leave the bloodstream?
A. No B. Yes